linux-kernel - Re: [PATCH 2/3] spi / ACPI: add ACPI enumeration support

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Message-ID: <20121105184910.1ecad91d@endymion.delvare>
Date:	Mon, 5 Nov 2012 18:49:10 +0100
From:	Jean Delvare <khali@...ux-fr.org>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linus Walleij <linus.walleij@...aro.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-kernel@...r.kernel.org, lenb@...nel.org,
	rafael.j.wysocki@...el.com, grant.likely@...retlab.ca,
	ben-linux@...ff.org, w.sang@...gutronix.de,
	mathias.nyman@...ux.intel.com, linux-acpi@...r.kernel.org
Subject: Re: [PATCH 2/3] spi / ACPI: add ACPI enumeration support

On Mon, 5 Nov 2012 19:12:48 +0200, Mika Westerberg wrote:
> On Mon, Nov 05, 2012 at 04:19:20PM +0100, Jean Delvare wrote:
> > I2C core fears that you're mixing up everything ;) I2C adapter devices
> > are struct i2c_adapter aka i2c-0, i2c-1 etc. i2c_client is for slave
> > devices. There's nothing wrong with i2c_clients sharing ->name, that's
> > even how device driver matching is achieved. The uniqueness of
> > i2c_clients is on their bus_id which is the combination of i2c adapter
> > number and slave address (e.g. 0-0050)
> 
> Yeah, I mixed I2C adapter and client. Thanks for correcting.
> 
> So if we create one I2C adapter from the platform bus code as we do now and
> then for each I2CSerialBus connector we create one I2C client (well, the
> one that is created when i2c_new_device() is called), everything should
> work, right?

Yes.

> Then I suggest that we have a list of serial bus resources in the struct
> acpi_device and create the I2C clients based on that.
> 
> > i2c_adapter->name should, OTOH, be unique. In i2c bus drivers we
> > usually append the base I/O address at the end of the name to guarantee
> > that. ACPI will have to come up with something similar.
> 
> It should already be unique in case of ACPI. We use ACPI _HID and _UID to
> achieve that.

Perfect.

-- 
Jean Delvare
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